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- W1977821297 abstract "The dissociative attachment cross section for formation of ${mathrm{H}}^{ensuremath{-}}$ and ${mathrm{D}}^{ensuremath{-}}$ from ${mathrm{H}}_{2}$, HD, and ${mathrm{D}}_{2}$ has been measured in the threshold range from 3.75 to 5 eV using a mass spectrometer for ion identification. A pronounced isotope effect is observed. The cross section of ${mathrm{H}}^{ensuremath{-}}$ from ${mathrm{H}}_{2}$ has a peak value of 1.6ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}21}$ ${mathrm{cm}}^{2}$; ${mathrm{D}}^{ensuremath{-}}$ from HD, 1ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}22}$ ${mathrm{cm}}^{2}$; and ${mathrm{D}}^{ensuremath{-}}$ from ${mathrm{D}}_{2}$, 8ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}24}$ ${mathrm{cm}}^{2}$; all peaks occurring at 3.75 eV. Negative-ion formation in this energy range proceeds via the compound state $^{2}{ensuremath{Sigma}}_{u}^{+}$ whose lifetime against autodetachment is calculated from the above cross sections to be about 1ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}15}$ sec. Because of this short lifetime and the relatively long time needed for the atoms to separate, the probability of survival of the negative ion, and therefore the dissociative-attachment cross section in ${mathrm{H}}_{2}$ at 3.75 eV, is small. For the heavier isotopes, the separation time is even longer and therefore the dissociative-attachment cross section is minute. The same compound state is also responsible for vibrational excitation of the hydrogen molecule." @default.
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- W1977821297 date "1967-06-05" @default.
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- W1977821297 title "Isotope Effect in the Dissociative Attachment in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>at Low Energy" @default.
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- W1977821297 doi "https://doi.org/10.1103/physrev.158.25" @default.
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